United Airlines UA643 Flight Status
According to Trip.com real-time data, the UA643 flight operated by United Airlines on Sep 21, 2026 is scheduled to fly from Las Vegas (LAS) to Houston (IAH). The flight is expected to depart at 06:00 (local time in Las Vegas, UTC-7) and land at 20:29 (local time in Houston, UTC-5) .
Sun, Sep 20
Mon, Sep 21
Tue, Sep 22
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Arrived
The flight has arrived 16m early
12h 29m
SFO
2h 33m
SNA
3h 30m
Check-in Counter
--
Boarding Gate
D51
Arrival Gate
E8
Baggage
C6
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Scheduled
Your flight will depart on time.
12h 29m
SFO
3h 12m
SNA
3h 46m
Check-in Counter
--
Boarding Gate
D56
Arrival Gate
C5
Baggage
C6
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Scheduled
Your flight will depart on time.
12h 29m
SFO
2h 40m
SNA
3h 4m
Check-in Counter
--
Boarding Gate
D50
Arrival Gate
--
Baggage
C6
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Information provided by VariFlight For real-time updates, please check airport displays or contact your airline.
Track the Previous Flight Status: Scheduled
UA1539
|
New York (NYC) 
Las Vegas (LAS)
Las Vegas (LAS)Scheduled: 18:59
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UA643 Aircraft Details
According to Trip.com real-time data, the UA643 flight flying from Las Vegas to Houston on 9/21/2026 is operated by the aircraft model Boeing 737 MAX 8. This aircraft has been in service for 3y, 2m. The aircraft is equipped with 166 seats.
Boeing 737 MAX 8
Punctuality (Departure)
93%
Punctuality (Arrival)
93%
Early on average
12 minutes
Age
3y, 2m
Seats
166
Flight Distance
--
Economy
First
Premium Economy
In-Flight Services
None
On-demand entertainment
Wi-Fi is available
USB port and power outlet
Seat Information
76 cm
More legroom than on 8% of flights
43 cm
Seat width better than on 63% of flights
100°
Reclining Angle
--
Seat layout example
In-Flight Services
Snacks
On-demand entertainment
Wi-Fi is available
USB port and power outlet
Seat Information
94 cm
Legroom
53 cm
Seat width better than on 91% of flights
120°
Reclining Angle
--
Seat layout example
In-Flight Services
Snacks
On-demand entertainment
Wi-Fi is available
USB port and power outlet
Seat Information
86 cm
Legroom
43 cm
Seat width
100°
Reclining Angle
--
Seat layout example
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Flight History for UA643
Trip.com historical records show that the last UA643 flight departed on Sun, Sep 20 from LAS at approximately 06:39. This flight is expected to arrrive in IAH at 20:13.
| Date | Airport | Aircraft Model | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Departure | Arrival | |||||
| Thu, Sep 17 | Las Vegas (LAS) | Houston (IAH) | B38M | 06:11 | 20:09 | Arrived |
| Fri, Sep 18 | Las Vegas (LAS) | Houston (IAH) | B38M | 06:07 | 20:11 | Arrived |
| Sat, Sep 19 | Las Vegas (LAS) | Houston (IAH) | B38M | 06:10 | 20:29 | Arrived |
| Sun, Sep 20 | Las Vegas (LAS) | Houston (IAH) | B38M | 06:39 | 20:13 | Arrived |
| Mon, Sep 21 | Las Vegas (LAS) | Houston (IAH) | B38M | 06:00 | 20:29 | Scheduled |
| Tue, Sep 22 | Las Vegas (LAS) | Houston (IAH) | B38M | 06:00 | 20:29 | Scheduled |
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UA643 On-Time Performance
Based on the average performance of this flight over the past 30 trips, the on-time departure rate of UA643 is 93% (Late on average 8 minutes), and the on-time arrival rate is 93% (Early on average 12 minutes).
On-Time Departures
Punctuality
93%
Late on average 8 minutes
Early
0%
On time
93%
30 mins late
7%
60 mins late
0%
90 mins late
0%
Canceled
0%
On-Time Arrivals
Punctuality
93%
Early on average 12 minutes
Early
80%
On time
13%
30 mins late
3%
60 mins late
0%
90 mins late
3%
Canceled
0%
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Frequently Asked Questions
What is the current status of flight ua643?
Flight ua643 has not departed yet and is currently on schedule. Scheduled departure 06:00, arrival 20:29 (updated Sep 21, 2026).Is flight ua643 on time today?
Flight ua643 has not departed yet and is currently on schedule. Scheduled departure is 06:00, with arrival at 20:29. Recheck gate and timing before you head to the airport.Has flight ua643 departed yet? What is the departure time?
Flight ua643 is scheduled to depart at 06:00. The latest actual or estimated departure time is 06:00, and the current status is Scheduled (updated Sep 21, 2026).When is flight ua643 scheduled to arrive?
Flight ua643 is scheduled to arrive at 20:29. The latest estimated or actual arrival time is 20:29. Status is Scheduled as of Sep 21, 2026.What is the gate information for flight ua643?
For flight ua643, the departure terminal is T3 and the boarding gate is D56. Gate assignments can change at short notice—confirm on airport screens before heading to security.What is the baggage carousel number for flight ua643?
After arrival, baggage for flight ua643 is expected at carousel C6 in terminal C. Carousel numbers are assigned close to landing and may change—follow airport signs on arrival.What route does flight ua643 fly?
Flight ua643 is operated by United Airlines from Las Vegas (LAS) to Houston (IAH). Typical flight time is about 12 hours29 minutes; operating days may include Monday.How can I check real-time status for flight ua643?
Track flight ua643 on this Trip.com status page for live departure, arrival, gate and baggage updates. For push alerts on the go, open the same flight in the Trip.com App and turn on flight notifications.If flight ua643 is delayed or canceled, what should I do?
If ua643 is delayed or canceled, first confirm the latest status here (Scheduled, updated Sep 21, 2026). Contact United Airlines or your booking channel for rebooking or refund options, and check Trip.com Manage Booking if you booked on Trip.com.Has flight ua643 departed from Las Vegas?
Flight ua643 has not departed from Las Vegas (LAS) yet and is currently on schedule for 06:00.
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Arrival Info: Houston Weather & Current Time
Mostly cloudy
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25°C - 36°C
Weather forecast for your arrival day
2 hour time difference
Time on arrival: Las Vegas 18:29| Houston 20:29
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